Re: Treeview help needed

[Vadim Berezniker <vadim berezniker com>]

wilfried kopp wrote:
> Hi everybody,
>
> I am stuck with a segmentation fault caused by a treeview and I have pent hours trying to figure out what's wrong with no success.
>
>
> Here is how I create the model (I simplified the code... but this version crashes as well...)
>   while (item)
>     {
>       gtk_list_store_append (store, &iter);
>       gtk_list_store_set (store, &iter,
> 			  MIME_TYPES_TO_SKIP_COLUMN_STATE, 0 ,
> 			  MIME_TYPES_TO_SKIP_COLUMN_MIME_TYPE, test,
> 			  -1);
>
>       item=g_list_next(item);
>     }

That looks OK.

> The segmentation fault happens when I remove an item with this code:
>  gtk_tree_model_get (model,&iter,
>   		      0, &state, 
>   		      1, &mime_type,
> 		      -1);

Why are you using constants such as (MIME_TYPES_TO_SKIP_COLUMN_STATE and 
MIME_TYPES_TO_SKIP_COLUMN_MIME_TYPE) in the code that adds data but 
referencing them by number here. This could lead to problems if the 
constants change later.

>   if (gtk_tree_selection_get_selected (listSelection, NULL, &iter))
>   {
>     gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
>   }
>
>
> Here is what ddd says:
> (gtktalog:5396): Gtk-CRITICAL **: file ../../gtk/gtkliststore.c: line 566 (gtk_list_store_get_value): assertion `GTK_LIST_STORE (tree_model)->stamp == iter->stamp' failed

The error seems to indicate that you modified the model after retrieving 
the iterator, which invalidates the iterator.